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	<h1>Infrastructure index</h1>

	There are several ways in which you can calculate infrastructure data based on maps from Bing, Google, Open and Sina.

		<h2>Download <a href="infra_time_series.html">time series</a> data</h2>

		Filesizes for various resolutions have been captured for three map servers.  <a href="infra_time_series.html">Download the time series</a>.

		<h2>Use the <a href="http://cran.r-project.org/web/packages/infra/">infra</a> package</h2>

		<a href="http://cran.r-project.org/web/packages/infra/">infra</a> is an R package available through <a href="http://cran.r-project.org/web/packages/infra/">CRAN</a>.  The <a href="http://cran.r-project.org/web/packages/infra/">CRAN website</a> has more information; you can also <a href="http://cran.r-project.org/web/packages/infra/infra.pdf">view the PDF</a>.

		<h2>Use the <a href="https://sourceforge.net/projects/spatialgridbuilder/">SpatialGridBuilder</a> program</h2>

		<a href="https://sourceforge.net/projects/spatialgridbuilder/">SpatialGridBuilder</a> is a standalone program for creating data grids.  It can download infrastructure data.  It's available on <a href="https://sourceforge.net/projects/spatialgridbuilder/">sourceforge</a>.

		<h2>Download the <a href="infra_r_code.txt">R code</a></h2>

		You can download the <a href="infra_r_code.txt">R code</a> to avoid installing an extra library.  Alternatively, this can be used as pseudo-code to build the routine in other languages.  Fundamentally, the trigonometry is the same for Google, Open, Sina and Bing; Bing is, however slightly different to the others in its used of quad-keys to organise maps.

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